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bootloader-update.md

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GRiSP 2 Boot Loader Update

Use the following instructions to update the Barebox boot loader for GRiSP 2 to the latest version.

  1. Copy barebox/barebox-phytec-phycore-imx6ul-emmc-512mb.img from this repository to a FAT32 formatted SD card (assuming the path /Volumes/GRISP to the SD card):

    $ cd grisp2-rtems-toolchain
$ cp barebox/barebox-phytec-phycore-imx6ul-emmc-512mb.img /Volumes/GRISP/
$ diskutil unmount /Volumes/GRISP # macOS

  2. Boot the board and abort the standard boot sequence by pressing enter at the prompt:

    barebox 2019.01.0-bsp-yocto-i.mx6ul-pd19.1.1 #5 Thu Aug 26 14:45:01 CEST 2021

Board: PHYTEC phyCORE-i.MX6 Ultra Light SOM with eMMC
detected i.MX6 ULL revision 1.1
i.MX reset reason POR (SRSR: 0x00000001)
i.MX6 ULL unique ID: 5988f541131f59d7
mdio_bus: miibus0: probed
eth0: got preset MAC address: 50:2d:f4:23:a1:cb
imx-usb [email protected]: USB EHCI 1.00
imx-esdhc [email protected]: registered as mmc0
imx-esdhc [email protected]: registered as mmc1
netconsole: registered as netconsole-1
phySOM-i.MX6: Using environment in MMC
malloc space: 0x8fe7d100 -> 0x9fcfa1ff (size 254.5 MiB)
mmc1: detected MMC card version 5.0
mmc1: registered mmc1.boot0
mmc1: registered mmc1.boot1
mmc1: registered mmc1
running /env/bin/init...

Hit m for menu or any key to stop autoboot:    3         <PRESS ENTER HERE>

type exit to get to the menu
...:/

  3. Verify that the new boot loader image is on the SD card:

    ...:/ ls /mnt/mmc 
mmc0: detected SD card version 2.0
mmc0: registered mmc0
.
..
barebox-phytec-phycore-imx6ul-emmc-512mb.img
grisp.ini
loader
myrelease

  4. Boot from that boot loader to verify that it works:

    ...:/ bootm /mnt/mmc/barebox-phytec-phycore-imx6ul-emmc-512mb.img 

Loading ARM barebox image '/mnt/mmc/barebox-phytec-phycore-imx6ul-emmc-512mb.img'
commandline: consoleblank=0 console=ttymxc0,115200n8   rootwait ro fsck.repair=yes
Starting kernel in secure mode

barebox 2019.01.0-bsp-yocto-i.mx6ul-pd19.1.1 #5 Thu Aug 26 14:45:01 CEST 2021
...

    Make sure booting into Erlang from the new bootloader works completely. The complete testing boot sequence should be as follows: Old Bootloader → New Bootloader → Erlang (or other software that you want to boot).

  5. Reset the board (into the old bootloader, or load the new bootloader again) and flash the new boot loader (press y when prompted):

    ...:/ barebox_update /mnt/mmc/barebox-phytec-phycore-imx6ul-emmc-512mb.img 
barebox_update /mnt/mmc/barebox-phytec-phycore-imx6ul-emmc-512mb.img
mmc0: detected SD card version 2.0
mmc0: registered mmc0
Image Metadata:
  build: #5 Thu Aug 26 14:45:01 CEST 2021
  release: 2019.01.0-bsp-yocto-i.mx6ul-pd19.1.1
  parameter: memsize=512
update barebox from /mnt/mmc/barebox-phytec-phycore-imx6ul-emmc-512mb.img using handler mmc1 to /dev/mmc1 (y/n)? y 
updating barebox...
update succeeded
...:/

  6. Reset the board. It should now boot into the new boot loader. The environment might look different, execute defaultenv -r to restore the default environment for that particular barebox binary. Non-volatile variables (nv) are not affected.